CVE-2026-98201

Input: zero ff_effect before compat copy in input_ff_effect_from_user

State: Published
Severity: Not scored
Published: Oct 6, 2026
Updated: Oct 19, 2026
Reserved: Sep 25, 2026

Description

In the Linux kernel, the following vulnerability has been resolved:

Input: zero ff_effect before compat copy in input_ff_effect_from_user

In the compat path input_ff_effect_from_user() aliases the caller's native struct ff_effect with the smaller struct ff_effect_compat and copies only the compat sized prefix:

compat_effect = (struct ff_effect_compat *)effect;

if (copy_from_user(compat_effect, buffer, sizeof(struct ff_effect_compat)))

The tail of the native structure is never written. Callers pass an uninitialized on-stack object, for example evdev_do_ioctl() for EVIOCSFF, so those bytes keep their previous stack contents. input_ff_upload() then stores the full native structure in ff->effects[id], from where a uinput based force feedback daemon can read it back via UI_BEGIN_FF_UPLOAD, disclosing kernel stack memory to userspace.

Zero the effect before the compat copy.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	2d56f3a32c0e62f99c043d2579840f9731fe5855 to before ed0905fda39682d3da7937184397d3276abbffa8Affected 2d56f3a32c0e62f99c043d2579840f9731fe5855 to before ec174c2ab1abb76b20fa167c6db848c3d97aa838Affected 2d56f3a32c0e62f99c043d2579840f9731fe5855 to before 6c26681c5668c973bd0e951407d670ac60d9cd66Affected 2d56f3a32c0e62f99c043d2579840f9731fe5855 to before c5e573bb095d502be7cbbaa99c26a20984111c6dAffected 2d56f3a32c0e62f99c043d2579840f9731fe5855 to before b878720e8bcaa4cf7163a5081f904dd6baf11b2cAffected 2d56f3a32c0e62f99c043d2579840f9731fe5855 to before 0d05b43b55d4784a42ce8fb318175f8ad7d9af5aAffected 2d56f3a32c0e62f99c043d2579840f9731fe5855 to before ed0406e490f48ed180df140fe2a81be26bccb1a9Affected 2d56f3a32c0e62f99c043d2579840f9731fe5855 to before f84819ef8d66931ee3998fee3c4f03230f4cb6ccAffected
LinuxLinux	2.6.29Affected before 2.6.29Not affected 5.10.271 through 5.10.Not affected 5.15.222 through 5.15.Not affected 6.1.189 through 6.1.Not affected 6.6.158 through 6.6.Not affected 6.12.112 through 6.12.Not affected 6.18.54 through 6.18.Not affected 7.2.8 through 7.2.*Not affected 7.3 and laterNot affected

Product

Versions

LinuxLinux

2d56f3a32c0e62f99c043d2579840f9731fe5855 to before ed0905fda39682d3da7937184397d3276abbffa8Affected
2d56f3a32c0e62f99c043d2579840f9731fe5855 to before ec174c2ab1abb76b20fa167c6db848c3d97aa838Affected
2d56f3a32c0e62f99c043d2579840f9731fe5855 to before 6c26681c5668c973bd0e951407d670ac60d9cd66Affected
2d56f3a32c0e62f99c043d2579840f9731fe5855 to before c5e573bb095d502be7cbbaa99c26a20984111c6dAffected
2d56f3a32c0e62f99c043d2579840f9731fe5855 to before b878720e8bcaa4cf7163a5081f904dd6baf11b2cAffected
2d56f3a32c0e62f99c043d2579840f9731fe5855 to before 0d05b43b55d4784a42ce8fb318175f8ad7d9af5aAffected
2d56f3a32c0e62f99c043d2579840f9731fe5855 to before ed0406e490f48ed180df140fe2a81be26bccb1a9Affected
2d56f3a32c0e62f99c043d2579840f9731fe5855 to before f84819ef8d66931ee3998fee3c4f03230f4cb6ccAffected

LinuxLinux

2.6.29Affected
before 2.6.29Not affected
5.10.271 through 5.10.*Not affected
5.15.222 through 5.15.*Not affected
6.1.189 through 6.1.*Not affected
6.6.158 through 6.6.*Not affected
6.12.112 through 6.12.*Not affected
6.18.54 through 6.18.*Not affected
7.2.8 through 7.2.*Not affected
7.3 and laterNot affected

References

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